Comfort Stop Feature
WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
The comfort stop feature represents a point between the close and full open position providing the greatest opening while minimizing wind buffeting. This feature is used instead of a windscreen. Maximum sunroof opening can still be achieved by operating the switch and requesting movement past the comfort stop position.